1/*
2    file operation functions
3    Copyright (C) 2003-2004  Kevin Thayer <nufan_wfk at yahoo.com>
4    Copyright (C) 2004  Chris Kennedy <c@groovy.org>
5    Copyright (C) 2005-2007  Hans Verkuil <hverkuil@xs4all.nl>
6
7    This program is free software; you can redistribute it and/or modify
8    it under the terms of the GNU General Public License as published by
9    the Free Software Foundation; either version 2 of the License, or
10    (at your option) any later version.
11
12    This program is distributed in the hope that it will be useful,
13    but WITHOUT ANY WARRANTY; without even the implied warranty of
14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15    GNU General Public License for more details.
16
17    You should have received a copy of the GNU General Public License
18    along with this program; if not, write to the Free Software
19    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
20 */
21
22#include "ivtv-driver.h"
23#include "ivtv-fileops.h"
24#include "ivtv-i2c.h"
25#include "ivtv-queue.h"
26#include "ivtv-udma.h"
27#include "ivtv-irq.h"
28#include "ivtv-vbi.h"
29#include "ivtv-mailbox.h"
30#include "ivtv-routing.h"
31#include "ivtv-streams.h"
32#include "ivtv-yuv.h"
33#include "ivtv-ioctl.h"
34#include "ivtv-cards.h"
35#include "ivtv-firmware.h"
36#include <media/v4l2-event.h>
37#include <media/saa7115.h>
38
39/* This function tries to claim the stream for a specific file descriptor.
40   If no one else is using this stream then the stream is claimed and
41   associated VBI streams are also automatically claimed.
42   Possible error returns: -EBUSY if someone else has claimed
43   the stream or 0 on success. */
44static int ivtv_claim_stream(struct ivtv_open_id *id, int type)
45{
46	struct ivtv *itv = id->itv;
47	struct ivtv_stream *s = &itv->streams[type];
48	struct ivtv_stream *s_vbi;
49	int vbi_type;
50
51	if (test_and_set_bit(IVTV_F_S_CLAIMED, &s->s_flags)) {
52		/* someone already claimed this stream */
53		if (s->fh == &id->fh) {
54			/* yes, this file descriptor did. So that's OK. */
55			return 0;
56		}
57		if (s->fh == NULL && (type == IVTV_DEC_STREAM_TYPE_VBI ||
58					 type == IVTV_ENC_STREAM_TYPE_VBI)) {
59			/* VBI is handled already internally, now also assign
60			   the file descriptor to this stream for external
61			   reading of the stream. */
62			s->fh = &id->fh;
63			IVTV_DEBUG_INFO("Start Read VBI\n");
64			return 0;
65		}
66		/* someone else is using this stream already */
67		IVTV_DEBUG_INFO("Stream %d is busy\n", type);
68		return -EBUSY;
69	}
70	s->fh = &id->fh;
71	if (type == IVTV_DEC_STREAM_TYPE_VBI) {
72		/* Enable reinsertion interrupt */
73		ivtv_clear_irq_mask(itv, IVTV_IRQ_DEC_VBI_RE_INSERT);
74	}
75
76	/* IVTV_DEC_STREAM_TYPE_MPG needs to claim IVTV_DEC_STREAM_TYPE_VBI,
77	   IVTV_ENC_STREAM_TYPE_MPG needs to claim IVTV_ENC_STREAM_TYPE_VBI
78	   (provided VBI insertion is on and sliced VBI is selected), for all
79	   other streams we're done */
80	if (type == IVTV_DEC_STREAM_TYPE_MPG) {
81		vbi_type = IVTV_DEC_STREAM_TYPE_VBI;
82	} else if (type == IVTV_ENC_STREAM_TYPE_MPG &&
83		   itv->vbi.insert_mpeg && !ivtv_raw_vbi(itv)) {
84		vbi_type = IVTV_ENC_STREAM_TYPE_VBI;
85	} else {
86		return 0;
87	}
88	s_vbi = &itv->streams[vbi_type];
89
90	if (!test_and_set_bit(IVTV_F_S_CLAIMED, &s_vbi->s_flags)) {
91		/* Enable reinsertion interrupt */
92		if (vbi_type == IVTV_DEC_STREAM_TYPE_VBI)
93			ivtv_clear_irq_mask(itv, IVTV_IRQ_DEC_VBI_RE_INSERT);
94	}
95	/* mark that it is used internally */
96	set_bit(IVTV_F_S_INTERNAL_USE, &s_vbi->s_flags);
97	return 0;
98}
99
100/* This function releases a previously claimed stream. It will take into
101   account associated VBI streams. */
102void ivtv_release_stream(struct ivtv_stream *s)
103{
104	struct ivtv *itv = s->itv;
105	struct ivtv_stream *s_vbi;
106
107	s->fh = NULL;
108	if ((s->type == IVTV_DEC_STREAM_TYPE_VBI || s->type == IVTV_ENC_STREAM_TYPE_VBI) &&
109		test_bit(IVTV_F_S_INTERNAL_USE, &s->s_flags)) {
110		/* this stream is still in use internally */
111		return;
112	}
113	if (!test_and_clear_bit(IVTV_F_S_CLAIMED, &s->s_flags)) {
114		IVTV_DEBUG_WARN("Release stream %s not in use!\n", s->name);
115		return;
116	}
117
118	ivtv_flush_queues(s);
119
120	/* disable reinsertion interrupt */
121	if (s->type == IVTV_DEC_STREAM_TYPE_VBI)
122		ivtv_set_irq_mask(itv, IVTV_IRQ_DEC_VBI_RE_INSERT);
123
124	/* IVTV_DEC_STREAM_TYPE_MPG needs to release IVTV_DEC_STREAM_TYPE_VBI,
125	   IVTV_ENC_STREAM_TYPE_MPG needs to release IVTV_ENC_STREAM_TYPE_VBI,
126	   for all other streams we're done */
127	if (s->type == IVTV_DEC_STREAM_TYPE_MPG)
128		s_vbi = &itv->streams[IVTV_DEC_STREAM_TYPE_VBI];
129	else if (s->type == IVTV_ENC_STREAM_TYPE_MPG)
130		s_vbi = &itv->streams[IVTV_ENC_STREAM_TYPE_VBI];
131	else
132		return;
133
134	/* clear internal use flag */
135	if (!test_and_clear_bit(IVTV_F_S_INTERNAL_USE, &s_vbi->s_flags)) {
136		/* was already cleared */
137		return;
138	}
139	if (s_vbi->fh) {
140		/* VBI stream still claimed by a file descriptor */
141		return;
142	}
143	/* disable reinsertion interrupt */
144	if (s_vbi->type == IVTV_DEC_STREAM_TYPE_VBI)
145		ivtv_set_irq_mask(itv, IVTV_IRQ_DEC_VBI_RE_INSERT);
146	clear_bit(IVTV_F_S_CLAIMED, &s_vbi->s_flags);
147	ivtv_flush_queues(s_vbi);
148}
149
150static void ivtv_dualwatch(struct ivtv *itv)
151{
152	struct v4l2_tuner vt;
153	u32 new_stereo_mode;
154	const u32 dual = 0x02;
155
156	new_stereo_mode = v4l2_ctrl_g_ctrl(itv->cxhdl.audio_mode);
157	memset(&vt, 0, sizeof(vt));
158	ivtv_call_all(itv, tuner, g_tuner, &vt);
159	if (vt.audmode == V4L2_TUNER_MODE_LANG1_LANG2 && (vt.rxsubchans & V4L2_TUNER_SUB_LANG2))
160		new_stereo_mode = dual;
161
162	if (new_stereo_mode == itv->dualwatch_stereo_mode)
163		return;
164
165	IVTV_DEBUG_INFO("dualwatch: change stereo flag from 0x%x to 0x%x.\n",
166			   itv->dualwatch_stereo_mode, new_stereo_mode);
167	if (v4l2_ctrl_s_ctrl(itv->cxhdl.audio_mode, new_stereo_mode))
168		IVTV_DEBUG_INFO("dualwatch: changing stereo flag failed\n");
169}
170
171static void ivtv_update_pgm_info(struct ivtv *itv)
172{
173	u32 wr_idx = (read_enc(itv->pgm_info_offset) - itv->pgm_info_offset - 4) / 24;
174	int cnt;
175	int i = 0;
176
177	if (wr_idx >= itv->pgm_info_num) {
178		IVTV_DEBUG_WARN("Invalid PGM index %d (>= %d)\n", wr_idx, itv->pgm_info_num);
179		return;
180	}
181	cnt = (wr_idx + itv->pgm_info_num - itv->pgm_info_write_idx) % itv->pgm_info_num;
182	while (i < cnt) {
183		int idx = (itv->pgm_info_write_idx + i) % itv->pgm_info_num;
184		struct v4l2_enc_idx_entry *e = itv->pgm_info + idx;
185		u32 addr = itv->pgm_info_offset + 4 + idx * 24;
186		const int mapping[8] = { -1, V4L2_ENC_IDX_FRAME_I, V4L2_ENC_IDX_FRAME_P, -1,
187			V4L2_ENC_IDX_FRAME_B, -1, -1, -1 };
188					// 1=I, 2=P, 4=B
189
190		e->offset = read_enc(addr + 4) + ((u64)read_enc(addr + 8) << 32);
191		if (e->offset > itv->mpg_data_received) {
192			break;
193		}
194		e->offset += itv->vbi_data_inserted;
195		e->length = read_enc(addr);
196		e->pts = read_enc(addr + 16) + ((u64)(read_enc(addr + 20) & 1) << 32);
197		e->flags = mapping[read_enc(addr + 12) & 7];
198		i++;
199	}
200	itv->pgm_info_write_idx = (itv->pgm_info_write_idx + i) % itv->pgm_info_num;
201}
202
203static struct ivtv_buffer *ivtv_get_buffer(struct ivtv_stream *s, int non_block, int *err)
204{
205	struct ivtv *itv = s->itv;
206	struct ivtv_stream *s_vbi = &itv->streams[IVTV_ENC_STREAM_TYPE_VBI];
207	struct ivtv_buffer *buf;
208	DEFINE_WAIT(wait);
209
210	*err = 0;
211	while (1) {
212		if (s->type == IVTV_ENC_STREAM_TYPE_MPG) {
213			/* Process pending program info updates and pending VBI data */
214			ivtv_update_pgm_info(itv);
215
216			if (time_after(jiffies,
217				       itv->dualwatch_jiffies +
218				       msecs_to_jiffies(1000))) {
219				itv->dualwatch_jiffies = jiffies;
220				ivtv_dualwatch(itv);
221			}
222
223			if (test_bit(IVTV_F_S_INTERNAL_USE, &s_vbi->s_flags) &&
224			    !test_bit(IVTV_F_S_APPL_IO, &s_vbi->s_flags)) {
225				while ((buf = ivtv_dequeue(s_vbi, &s_vbi->q_full))) {
226					/* byteswap and process VBI data */
227					ivtv_process_vbi_data(itv, buf, s_vbi->dma_pts, s_vbi->type);
228					ivtv_enqueue(s_vbi, buf, &s_vbi->q_free);
229				}
230			}
231			buf = &itv->vbi.sliced_mpeg_buf;
232			if (buf->readpos != buf->bytesused) {
233				return buf;
234			}
235		}
236
237		/* do we have leftover data? */
238		buf = ivtv_dequeue(s, &s->q_io);
239		if (buf)
240			return buf;
241
242		/* do we have new data? */
243		buf = ivtv_dequeue(s, &s->q_full);
244		if (buf) {
245			if ((buf->b_flags & IVTV_F_B_NEED_BUF_SWAP) == 0)
246				return buf;
247			buf->b_flags &= ~IVTV_F_B_NEED_BUF_SWAP;
248			if (s->type == IVTV_ENC_STREAM_TYPE_MPG)
249				/* byteswap MPG data */
250				ivtv_buf_swap(buf);
251			else if (s->type != IVTV_DEC_STREAM_TYPE_VBI) {
252				/* byteswap and process VBI data */
253				ivtv_process_vbi_data(itv, buf, s->dma_pts, s->type);
254			}
255			return buf;
256		}
257
258		/* return if end of stream */
259		if (s->type != IVTV_DEC_STREAM_TYPE_VBI && !test_bit(IVTV_F_S_STREAMING, &s->s_flags)) {
260			IVTV_DEBUG_INFO("EOS %s\n", s->name);
261			return NULL;
262		}
263
264		/* return if file was opened with O_NONBLOCK */
265		if (non_block) {
266			*err = -EAGAIN;
267			return NULL;
268		}
269
270		/* wait for more data to arrive */
271		mutex_unlock(&itv->serialize_lock);
272		prepare_to_wait(&s->waitq, &wait, TASK_INTERRUPTIBLE);
273		/* New buffers might have become available before we were added to the waitqueue */
274		if (!s->q_full.buffers)
275			schedule();
276		finish_wait(&s->waitq, &wait);
277		mutex_lock(&itv->serialize_lock);
278		if (signal_pending(current)) {
279			/* return if a signal was received */
280			IVTV_DEBUG_INFO("User stopped %s\n", s->name);
281			*err = -EINTR;
282			return NULL;
283		}
284	}
285}
286
287static void ivtv_setup_sliced_vbi_buf(struct ivtv *itv)
288{
289	int idx = itv->vbi.inserted_frame % IVTV_VBI_FRAMES;
290
291	itv->vbi.sliced_mpeg_buf.buf = itv->vbi.sliced_mpeg_data[idx];
292	itv->vbi.sliced_mpeg_buf.bytesused = itv->vbi.sliced_mpeg_size[idx];
293	itv->vbi.sliced_mpeg_buf.readpos = 0;
294}
295
296static size_t ivtv_copy_buf_to_user(struct ivtv_stream *s, struct ivtv_buffer *buf,
297		char __user *ubuf, size_t ucount)
298{
299	struct ivtv *itv = s->itv;
300	size_t len = buf->bytesused - buf->readpos;
301
302	if (len > ucount) len = ucount;
303	if (itv->vbi.insert_mpeg && s->type == IVTV_ENC_STREAM_TYPE_MPG &&
304	    !ivtv_raw_vbi(itv) && buf != &itv->vbi.sliced_mpeg_buf) {
305		const char *start = buf->buf + buf->readpos;
306		const char *p = start + 1;
307		const u8 *q;
308		u8 ch = itv->search_pack_header ? 0xba : 0xe0;
309		int stuffing, i;
310
311		while (start + len > p && (q = memchr(p, 0, start + len - p))) {
312			p = q + 1;
313			if ((char *)q + 15 >= buf->buf + buf->bytesused ||
314			    q[1] != 0 || q[2] != 1 || q[3] != ch) {
315				continue;
316			}
317			if (!itv->search_pack_header) {
318				if ((q[6] & 0xc0) != 0x80)
319					continue;
320				if (((q[7] & 0xc0) == 0x80 && (q[9] & 0xf0) == 0x20) ||
321				    ((q[7] & 0xc0) == 0xc0 && (q[9] & 0xf0) == 0x30)) {
322					ch = 0xba;
323					itv->search_pack_header = 1;
324					p = q + 9;
325				}
326				continue;
327			}
328			stuffing = q[13] & 7;
329			/* all stuffing bytes must be 0xff */
330			for (i = 0; i < stuffing; i++)
331				if (q[14 + i] != 0xff)
332					break;
333			if (i == stuffing && (q[4] & 0xc4) == 0x44 && (q[12] & 3) == 3 &&
334					q[14 + stuffing] == 0 && q[15 + stuffing] == 0 &&
335					q[16 + stuffing] == 1) {
336				itv->search_pack_header = 0;
337				len = (char *)q - start;
338				ivtv_setup_sliced_vbi_buf(itv);
339				break;
340			}
341		}
342	}
343	if (copy_to_user(ubuf, (u8 *)buf->buf + buf->readpos, len)) {
344		IVTV_DEBUG_WARN("copy %zd bytes to user failed for %s\n", len, s->name);
345		return -EFAULT;
346	}
347	/*IVTV_INFO("copied %lld %d %d %d %d %d vbi %d\n", itv->mpg_data_received, len, ucount,
348			buf->readpos, buf->bytesused, buf->bytesused - buf->readpos - len,
349			buf == &itv->vbi.sliced_mpeg_buf); */
350	buf->readpos += len;
351	if (s->type == IVTV_ENC_STREAM_TYPE_MPG && buf != &itv->vbi.sliced_mpeg_buf)
352		itv->mpg_data_received += len;
353	return len;
354}
355
356static ssize_t ivtv_read(struct ivtv_stream *s, char __user *ubuf, size_t tot_count, int non_block)
357{
358	struct ivtv *itv = s->itv;
359	size_t tot_written = 0;
360	int single_frame = 0;
361
362	if (atomic_read(&itv->capturing) == 0 && s->fh == NULL) {
363		/* shouldn't happen */
364		IVTV_DEBUG_WARN("Stream %s not initialized before read\n", s->name);
365		return -EIO;
366	}
367
368	/* Each VBI buffer is one frame, the v4l2 API says that for VBI the frames should
369	   arrive one-by-one, so make sure we never output more than one VBI frame at a time */
370	if (s->type == IVTV_DEC_STREAM_TYPE_VBI ||
371	    (s->type == IVTV_ENC_STREAM_TYPE_VBI && !ivtv_raw_vbi(itv)))
372		single_frame = 1;
373
374	for (;;) {
375		struct ivtv_buffer *buf;
376		int rc;
377
378		buf = ivtv_get_buffer(s, non_block, &rc);
379		/* if there is no data available... */
380		if (buf == NULL) {
381			/* if we got data, then return that regardless */
382			if (tot_written)
383				break;
384			/* EOS condition */
385			if (rc == 0) {
386				clear_bit(IVTV_F_S_STREAMOFF, &s->s_flags);
387				clear_bit(IVTV_F_S_APPL_IO, &s->s_flags);
388				ivtv_release_stream(s);
389			}
390			/* set errno */
391			return rc;
392		}
393		rc = ivtv_copy_buf_to_user(s, buf, ubuf + tot_written, tot_count - tot_written);
394		if (buf != &itv->vbi.sliced_mpeg_buf) {
395			ivtv_enqueue(s, buf, (buf->readpos == buf->bytesused) ? &s->q_free : &s->q_io);
396		}
397		else if (buf->readpos == buf->bytesused) {
398			int idx = itv->vbi.inserted_frame % IVTV_VBI_FRAMES;
399			itv->vbi.sliced_mpeg_size[idx] = 0;
400			itv->vbi.inserted_frame++;
401			itv->vbi_data_inserted += buf->bytesused;
402		}
403		if (rc < 0)
404			return rc;
405		tot_written += rc;
406
407		if (tot_written == tot_count || single_frame)
408			break;
409	}
410	return tot_written;
411}
412
413static ssize_t ivtv_read_pos(struct ivtv_stream *s, char __user *ubuf, size_t count,
414			loff_t *pos, int non_block)
415{
416	ssize_t rc = count ? ivtv_read(s, ubuf, count, non_block) : 0;
417	struct ivtv *itv = s->itv;
418
419	IVTV_DEBUG_HI_FILE("read %zd from %s, got %zd\n", count, s->name, rc);
420	if (rc > 0)
421		pos += rc;
422	return rc;
423}
424
425int ivtv_start_capture(struct ivtv_open_id *id)
426{
427	struct ivtv *itv = id->itv;
428	struct ivtv_stream *s = &itv->streams[id->type];
429	struct ivtv_stream *s_vbi;
430
431	if (s->type == IVTV_ENC_STREAM_TYPE_RAD ||
432	    s->type == IVTV_DEC_STREAM_TYPE_MPG ||
433	    s->type == IVTV_DEC_STREAM_TYPE_YUV ||
434	    s->type == IVTV_DEC_STREAM_TYPE_VOUT) {
435		/* you cannot read from these stream types. */
436		return -EPERM;
437	}
438
439	/* Try to claim this stream. */
440	if (ivtv_claim_stream(id, s->type))
441		return -EBUSY;
442
443	/* This stream does not need to start capturing */
444	if (s->type == IVTV_DEC_STREAM_TYPE_VBI) {
445		set_bit(IVTV_F_S_APPL_IO, &s->s_flags);
446		return 0;
447	}
448
449	/* If capture is already in progress, then we also have to
450	   do nothing extra. */
451	if (test_bit(IVTV_F_S_STREAMOFF, &s->s_flags) || test_and_set_bit(IVTV_F_S_STREAMING, &s->s_flags)) {
452		set_bit(IVTV_F_S_APPL_IO, &s->s_flags);
453		return 0;
454	}
455
456	/* Start VBI capture if required */
457	s_vbi = &itv->streams[IVTV_ENC_STREAM_TYPE_VBI];
458	if (s->type == IVTV_ENC_STREAM_TYPE_MPG &&
459	    test_bit(IVTV_F_S_INTERNAL_USE, &s_vbi->s_flags) &&
460	    !test_and_set_bit(IVTV_F_S_STREAMING, &s_vbi->s_flags)) {
461		/* Note: the IVTV_ENC_STREAM_TYPE_VBI is claimed
462		   automatically when the MPG stream is claimed.
463		   We only need to start the VBI capturing. */
464		if (ivtv_start_v4l2_encode_stream(s_vbi)) {
465			IVTV_DEBUG_WARN("VBI capture start failed\n");
466
467			/* Failure, clean up and return an error */
468			clear_bit(IVTV_F_S_STREAMING, &s_vbi->s_flags);
469			clear_bit(IVTV_F_S_STREAMING, &s->s_flags);
470			/* also releases the associated VBI stream */
471			ivtv_release_stream(s);
472			return -EIO;
473		}
474		IVTV_DEBUG_INFO("VBI insertion started\n");
475	}
476
477	/* Tell the card to start capturing */
478	if (!ivtv_start_v4l2_encode_stream(s)) {
479		/* We're done */
480		set_bit(IVTV_F_S_APPL_IO, &s->s_flags);
481		/* Resume a possibly paused encoder */
482		if (test_and_clear_bit(IVTV_F_I_ENC_PAUSED, &itv->i_flags))
483			ivtv_vapi(itv, CX2341X_ENC_PAUSE_ENCODER, 1, 1);
484		return 0;
485	}
486
487	/* failure, clean up */
488	IVTV_DEBUG_WARN("Failed to start capturing for stream %s\n", s->name);
489
490	/* Note: the IVTV_ENC_STREAM_TYPE_VBI is released
491	   automatically when the MPG stream is released.
492	   We only need to stop the VBI capturing. */
493	if (s->type == IVTV_ENC_STREAM_TYPE_MPG &&
494	    test_bit(IVTV_F_S_STREAMING, &s_vbi->s_flags)) {
495		ivtv_stop_v4l2_encode_stream(s_vbi, 0);
496		clear_bit(IVTV_F_S_STREAMING, &s_vbi->s_flags);
497	}
498	clear_bit(IVTV_F_S_STREAMING, &s->s_flags);
499	ivtv_release_stream(s);
500	return -EIO;
501}
502
503ssize_t ivtv_v4l2_read(struct file * filp, char __user *buf, size_t count, loff_t * pos)
504{
505	struct ivtv_open_id *id = fh2id(filp->private_data);
506	struct ivtv *itv = id->itv;
507	struct ivtv_stream *s = &itv->streams[id->type];
508	int rc;
509
510	IVTV_DEBUG_HI_FILE("read %zd bytes from %s\n", count, s->name);
511
512	rc = ivtv_start_capture(id);
513	if (rc)
514		return rc;
515	return ivtv_read_pos(s, buf, count, pos, filp->f_flags & O_NONBLOCK);
516}
517
518int ivtv_start_decoding(struct ivtv_open_id *id, int speed)
519{
520	struct ivtv *itv = id->itv;
521	struct ivtv_stream *s = &itv->streams[id->type];
522	int rc;
523
524	if (atomic_read(&itv->decoding) == 0) {
525		if (ivtv_claim_stream(id, s->type)) {
526			/* someone else is using this stream already */
527			IVTV_DEBUG_WARN("start decode, stream already claimed\n");
528			return -EBUSY;
529		}
530		rc = ivtv_start_v4l2_decode_stream(s, 0);
531		if (rc < 0) {
532			if (rc == -EAGAIN)
533				rc = ivtv_start_v4l2_decode_stream(s, 0);
534			if (rc < 0)
535				return rc;
536		}
537	}
538	if (s->type == IVTV_DEC_STREAM_TYPE_MPG)
539		return ivtv_set_speed(itv, speed);
540	return 0;
541}
542
543ssize_t ivtv_v4l2_write(struct file *filp, const char __user *user_buf, size_t count, loff_t *pos)
544{
545	struct ivtv_open_id *id = fh2id(filp->private_data);
546	struct ivtv *itv = id->itv;
547	struct ivtv_stream *s = &itv->streams[id->type];
548	struct yuv_playback_info *yi = &itv->yuv_info;
549	struct ivtv_buffer *buf;
550	struct ivtv_queue q;
551	int bytes_written = 0;
552	int mode;
553	int rc;
554	DEFINE_WAIT(wait);
555
556	IVTV_DEBUG_HI_FILE("write %zd bytes to %s\n", count, s->name);
557
558	if (s->type != IVTV_DEC_STREAM_TYPE_MPG &&
559	    s->type != IVTV_DEC_STREAM_TYPE_YUV &&
560	    s->type != IVTV_DEC_STREAM_TYPE_VOUT)
561		/* not decoder streams */
562		return -EPERM;
563
564	/* Try to claim this stream */
565	if (ivtv_claim_stream(id, s->type))
566		return -EBUSY;
567
568	/* This stream does not need to start any decoding */
569	if (s->type == IVTV_DEC_STREAM_TYPE_VOUT) {
570		int elems = count / sizeof(struct v4l2_sliced_vbi_data);
571
572		set_bit(IVTV_F_S_APPL_IO, &s->s_flags);
573		return ivtv_write_vbi_from_user(itv,
574		   (const struct v4l2_sliced_vbi_data __user *)user_buf, elems);
575	}
576
577	mode = s->type == IVTV_DEC_STREAM_TYPE_MPG ? OUT_MPG : OUT_YUV;
578
579	if (ivtv_set_output_mode(itv, mode) != mode) {
580	    ivtv_release_stream(s);
581	    return -EBUSY;
582	}
583	ivtv_queue_init(&q);
584	set_bit(IVTV_F_S_APPL_IO, &s->s_flags);
585
586	/* Start decoder (returns 0 if already started) */
587	rc = ivtv_start_decoding(id, itv->speed);
588	if (rc) {
589		IVTV_DEBUG_WARN("Failed start decode stream %s\n", s->name);
590
591		/* failure, clean up */
592		clear_bit(IVTV_F_S_STREAMING, &s->s_flags);
593		clear_bit(IVTV_F_S_APPL_IO, &s->s_flags);
594		return rc;
595	}
596
597retry:
598	/* If possible, just DMA the entire frame - Check the data transfer size
599	since we may get here before the stream has been fully set-up */
600	if (mode == OUT_YUV && s->q_full.length == 0 && itv->dma_data_req_size) {
601		while (count >= itv->dma_data_req_size) {
602			rc = ivtv_yuv_udma_stream_frame(itv, (void __user *)user_buf);
603
604			if (rc < 0)
605				return rc;
606
607			bytes_written += itv->dma_data_req_size;
608			user_buf += itv->dma_data_req_size;
609			count -= itv->dma_data_req_size;
610		}
611		if (count == 0) {
612			IVTV_DEBUG_HI_FILE("Wrote %d bytes to %s (%d)\n", bytes_written, s->name, s->q_full.bytesused);
613			return bytes_written;
614		}
615	}
616
617	for (;;) {
618		/* Gather buffers */
619		while (q.length - q.bytesused < count && (buf = ivtv_dequeue(s, &s->q_io)))
620			ivtv_enqueue(s, buf, &q);
621		while (q.length - q.bytesused < count && (buf = ivtv_dequeue(s, &s->q_free))) {
622			ivtv_enqueue(s, buf, &q);
623		}
624		if (q.buffers)
625			break;
626		if (filp->f_flags & O_NONBLOCK)
627			return -EAGAIN;
628		mutex_unlock(&itv->serialize_lock);
629		prepare_to_wait(&s->waitq, &wait, TASK_INTERRUPTIBLE);
630		/* New buffers might have become free before we were added to the waitqueue */
631		if (!s->q_free.buffers)
632			schedule();
633		finish_wait(&s->waitq, &wait);
634		mutex_lock(&itv->serialize_lock);
635		if (signal_pending(current)) {
636			IVTV_DEBUG_INFO("User stopped %s\n", s->name);
637			return -EINTR;
638		}
639	}
640
641	/* copy user data into buffers */
642	while ((buf = ivtv_dequeue(s, &q))) {
643		/* yuv is a pain. Don't copy more data than needed for a single
644		   frame, otherwise we lose sync with the incoming stream */
645		if (s->type == IVTV_DEC_STREAM_TYPE_YUV &&
646		    yi->stream_size + count > itv->dma_data_req_size)
647			rc  = ivtv_buf_copy_from_user(s, buf, user_buf,
648				itv->dma_data_req_size - yi->stream_size);
649		else
650			rc = ivtv_buf_copy_from_user(s, buf, user_buf, count);
651
652		/* Make sure we really got all the user data */
653		if (rc < 0) {
654			ivtv_queue_move(s, &q, NULL, &s->q_free, 0);
655			return rc;
656		}
657		user_buf += rc;
658		count -= rc;
659		bytes_written += rc;
660
661		if (s->type == IVTV_DEC_STREAM_TYPE_YUV) {
662			yi->stream_size += rc;
663			/* If we have a complete yuv frame, break loop now */
664			if (yi->stream_size == itv->dma_data_req_size) {
665				ivtv_enqueue(s, buf, &s->q_full);
666				yi->stream_size = 0;
667				break;
668			}
669		}
670
671		if (buf->bytesused != s->buf_size) {
672			/* incomplete, leave in q_io for next time */
673			ivtv_enqueue(s, buf, &s->q_io);
674			break;
675		}
676		/* Byteswap MPEG buffer */
677		if (s->type == IVTV_DEC_STREAM_TYPE_MPG)
678			ivtv_buf_swap(buf);
679		ivtv_enqueue(s, buf, &s->q_full);
680	}
681
682	if (test_bit(IVTV_F_S_NEEDS_DATA, &s->s_flags)) {
683		if (s->q_full.length >= itv->dma_data_req_size) {
684			int got_sig;
685
686			if (mode == OUT_YUV)
687				ivtv_yuv_setup_stream_frame(itv);
688
689			mutex_unlock(&itv->serialize_lock);
690			prepare_to_wait(&itv->dma_waitq, &wait, TASK_INTERRUPTIBLE);
691			while (!(got_sig = signal_pending(current)) &&
692					test_bit(IVTV_F_S_DMA_PENDING, &s->s_flags)) {
693				schedule();
694			}
695			finish_wait(&itv->dma_waitq, &wait);
696			mutex_lock(&itv->serialize_lock);
697			if (got_sig) {
698				IVTV_DEBUG_INFO("User interrupted %s\n", s->name);
699				return -EINTR;
700			}
701
702			clear_bit(IVTV_F_S_NEEDS_DATA, &s->s_flags);
703			ivtv_queue_move(s, &s->q_full, NULL, &s->q_predma, itv->dma_data_req_size);
704			ivtv_dma_stream_dec_prepare(s, itv->dma_data_req_offset + IVTV_DECODER_OFFSET, 1);
705		}
706	}
707	/* more user data is available, wait until buffers become free
708	   to transfer the rest. */
709	if (count && !(filp->f_flags & O_NONBLOCK))
710		goto retry;
711	IVTV_DEBUG_HI_FILE("Wrote %d bytes to %s (%d)\n", bytes_written, s->name, s->q_full.bytesused);
712	return bytes_written;
713}
714
715unsigned int ivtv_v4l2_dec_poll(struct file *filp, poll_table *wait)
716{
717	struct ivtv_open_id *id = fh2id(filp->private_data);
718	struct ivtv *itv = id->itv;
719	struct ivtv_stream *s = &itv->streams[id->type];
720	int res = 0;
721
722	/* add stream's waitq to the poll list */
723	IVTV_DEBUG_HI_FILE("Decoder poll\n");
724
725	/* If there are subscribed events, then only use the new event
726	   API instead of the old video.h based API. */
727	if (!list_empty(&id->fh.subscribed)) {
728		poll_wait(filp, &id->fh.wait, wait);
729		/* Turn off the old-style vsync events */
730		clear_bit(IVTV_F_I_EV_VSYNC_ENABLED, &itv->i_flags);
731		if (v4l2_event_pending(&id->fh))
732			res = POLLPRI;
733	} else {
734		/* This is the old-style API which is here only for backwards
735		   compatibility. */
736		poll_wait(filp, &s->waitq, wait);
737		set_bit(IVTV_F_I_EV_VSYNC_ENABLED, &itv->i_flags);
738		if (test_bit(IVTV_F_I_EV_VSYNC, &itv->i_flags) ||
739		    test_bit(IVTV_F_I_EV_DEC_STOPPED, &itv->i_flags))
740			res = POLLPRI;
741	}
742
743	/* Allow write if buffers are available for writing */
744	if (s->q_free.buffers)
745		res |= POLLOUT | POLLWRNORM;
746	return res;
747}
748
749unsigned int ivtv_v4l2_enc_poll(struct file *filp, poll_table * wait)
750{
751	struct ivtv_open_id *id = fh2id(filp->private_data);
752	struct ivtv *itv = id->itv;
753	struct ivtv_stream *s = &itv->streams[id->type];
754	int eof = test_bit(IVTV_F_S_STREAMOFF, &s->s_flags);
755	unsigned res = 0;
756
757	/* Start a capture if there is none */
758	if (!eof && !test_bit(IVTV_F_S_STREAMING, &s->s_flags)) {
759		int rc;
760
761		rc = ivtv_start_capture(id);
762		if (rc) {
763			IVTV_DEBUG_INFO("Could not start capture for %s (%d)\n",
764					s->name, rc);
765			return POLLERR;
766		}
767		IVTV_DEBUG_FILE("Encoder poll started capture\n");
768	}
769
770	/* add stream's waitq to the poll list */
771	IVTV_DEBUG_HI_FILE("Encoder poll\n");
772	poll_wait(filp, &s->waitq, wait);
773	if (v4l2_event_pending(&id->fh))
774		res |= POLLPRI;
775	else
776		poll_wait(filp, &id->fh.wait, wait);
777
778	if (s->q_full.length || s->q_io.length)
779		return res | POLLIN | POLLRDNORM;
780	if (eof)
781		return res | POLLHUP;
782	return res;
783}
784
785void ivtv_stop_capture(struct ivtv_open_id *id, int gop_end)
786{
787	struct ivtv *itv = id->itv;
788	struct ivtv_stream *s = &itv->streams[id->type];
789
790	IVTV_DEBUG_FILE("close() of %s\n", s->name);
791
792	/* 'Unclaim' this stream */
793
794	/* Stop capturing */
795	if (test_bit(IVTV_F_S_STREAMING, &s->s_flags)) {
796		struct ivtv_stream *s_vbi = &itv->streams[IVTV_ENC_STREAM_TYPE_VBI];
797
798		IVTV_DEBUG_INFO("close stopping capture\n");
799		/* Special case: a running VBI capture for VBI insertion
800		   in the mpeg stream. Need to stop that too. */
801		if (id->type == IVTV_ENC_STREAM_TYPE_MPG &&
802		    test_bit(IVTV_F_S_STREAMING, &s_vbi->s_flags) &&
803		    !test_bit(IVTV_F_S_APPL_IO, &s_vbi->s_flags)) {
804			IVTV_DEBUG_INFO("close stopping embedded VBI capture\n");
805			ivtv_stop_v4l2_encode_stream(s_vbi, 0);
806		}
807		if ((id->type == IVTV_DEC_STREAM_TYPE_VBI ||
808		     id->type == IVTV_ENC_STREAM_TYPE_VBI) &&
809		    test_bit(IVTV_F_S_INTERNAL_USE, &s->s_flags)) {
810			/* Also used internally, don't stop capturing */
811			s->fh = NULL;
812		}
813		else {
814			ivtv_stop_v4l2_encode_stream(s, gop_end);
815		}
816	}
817	if (!gop_end) {
818		clear_bit(IVTV_F_S_APPL_IO, &s->s_flags);
819		clear_bit(IVTV_F_S_STREAMOFF, &s->s_flags);
820		ivtv_release_stream(s);
821	}
822}
823
824static void ivtv_stop_decoding(struct ivtv_open_id *id, int flags, u64 pts)
825{
826	struct ivtv *itv = id->itv;
827	struct ivtv_stream *s = &itv->streams[id->type];
828
829	IVTV_DEBUG_FILE("close() of %s\n", s->name);
830
831	if (id->type == IVTV_DEC_STREAM_TYPE_YUV &&
832		test_bit(IVTV_F_I_DECODING_YUV, &itv->i_flags)) {
833		/* Restore registers we've changed & clean up any mess */
834		ivtv_yuv_close(itv);
835	}
836
837	/* Stop decoding */
838	if (test_bit(IVTV_F_S_STREAMING, &s->s_flags)) {
839		IVTV_DEBUG_INFO("close stopping decode\n");
840
841		ivtv_stop_v4l2_decode_stream(s, flags, pts);
842		itv->output_mode = OUT_NONE;
843	}
844	clear_bit(IVTV_F_S_APPL_IO, &s->s_flags);
845	clear_bit(IVTV_F_S_STREAMOFF, &s->s_flags);
846
847	if (itv->output_mode == OUT_UDMA_YUV && id->yuv_frames)
848		itv->output_mode = OUT_NONE;
849
850	itv->speed = 0;
851	clear_bit(IVTV_F_I_DEC_PAUSED, &itv->i_flags);
852	ivtv_release_stream(s);
853}
854
855int ivtv_v4l2_close(struct file *filp)
856{
857	struct v4l2_fh *fh = filp->private_data;
858	struct ivtv_open_id *id = fh2id(fh);
859	struct ivtv *itv = id->itv;
860	struct ivtv_stream *s = &itv->streams[id->type];
861
862	IVTV_DEBUG_FILE("close %s\n", s->name);
863
864	/* Stop radio */
865	if (id->type == IVTV_ENC_STREAM_TYPE_RAD &&
866			v4l2_fh_is_singular_file(filp)) {
867		/* Closing radio device, return to TV mode */
868		ivtv_mute(itv);
869		/* Mark that the radio is no longer in use */
870		clear_bit(IVTV_F_I_RADIO_USER, &itv->i_flags);
871		/* Switch tuner to TV */
872		ivtv_call_all(itv, core, s_std, itv->std);
873		/* Select correct audio input (i.e. TV tuner or Line in) */
874		ivtv_audio_set_io(itv);
875		if (itv->hw_flags & IVTV_HW_SAA711X) {
876			ivtv_call_hw(itv, IVTV_HW_SAA711X, video, s_crystal_freq,
877					SAA7115_FREQ_32_11_MHZ, 0);
878		}
879		if (atomic_read(&itv->capturing) > 0) {
880			/* Undo video mute */
881			ivtv_vapi(itv, CX2341X_ENC_MUTE_VIDEO, 1,
882					v4l2_ctrl_g_ctrl(itv->cxhdl.video_mute) |
883					(v4l2_ctrl_g_ctrl(itv->cxhdl.video_mute_yuv) << 8));
884		}
885		/* Done! Unmute and continue. */
886		ivtv_unmute(itv);
887	}
888
889	v4l2_fh_del(fh);
890	v4l2_fh_exit(fh);
891
892	/* Easy case first: this stream was never claimed by us */
893	if (s->fh != &id->fh) {
894		kfree(id);
895		return 0;
896	}
897
898	/* 'Unclaim' this stream */
899
900	if (s->type >= IVTV_DEC_STREAM_TYPE_MPG) {
901		struct ivtv_stream *s_vout = &itv->streams[IVTV_DEC_STREAM_TYPE_VOUT];
902
903		ivtv_stop_decoding(id, VIDEO_CMD_STOP_TO_BLACK | VIDEO_CMD_STOP_IMMEDIATELY, 0);
904
905		/* If all output streams are closed, and if the user doesn't have
906		   IVTV_DEC_STREAM_TYPE_VOUT open, then disable CC on TV-out. */
907		if (itv->output_mode == OUT_NONE && !test_bit(IVTV_F_S_APPL_IO, &s_vout->s_flags)) {
908			/* disable CC on TV-out */
909			ivtv_disable_cc(itv);
910		}
911	} else {
912		ivtv_stop_capture(id, 0);
913	}
914	kfree(id);
915	return 0;
916}
917
918int ivtv_v4l2_open(struct file *filp)
919{
920	struct video_device *vdev = video_devdata(filp);
921	struct ivtv_stream *s = video_get_drvdata(vdev);
922	struct ivtv *itv = s->itv;
923	struct ivtv_open_id *item;
924	int res = 0;
925
926	IVTV_DEBUG_FILE("open %s\n", s->name);
927
928	if (ivtv_init_on_first_open(itv)) {
929		IVTV_ERR("Failed to initialize on device %s\n",
930			 video_device_node_name(vdev));
931		return -ENXIO;
932	}
933
934#ifdef CONFIG_VIDEO_ADV_DEBUG
935	/* Unless ivtv_fw_debug is set, error out if firmware dead. */
936	if (ivtv_fw_debug) {
937		IVTV_WARN("Opening %s with dead firmware lockout disabled\n",
938			  video_device_node_name(vdev));
939		IVTV_WARN("Selected firmware errors will be ignored\n");
940	} else {
941#else
942	if (1) {
943#endif
944		res = ivtv_firmware_check(itv, "ivtv_serialized_open");
945		if (res == -EAGAIN)
946			res = ivtv_firmware_check(itv, "ivtv_serialized_open");
947		if (res < 0)
948			return -EIO;
949	}
950
951	if (s->type == IVTV_DEC_STREAM_TYPE_MPG &&
952		test_bit(IVTV_F_S_CLAIMED, &itv->streams[IVTV_DEC_STREAM_TYPE_YUV].s_flags))
953		return -EBUSY;
954
955	if (s->type == IVTV_DEC_STREAM_TYPE_YUV &&
956		test_bit(IVTV_F_S_CLAIMED, &itv->streams[IVTV_DEC_STREAM_TYPE_MPG].s_flags))
957		return -EBUSY;
958
959	if (s->type == IVTV_DEC_STREAM_TYPE_YUV) {
960		if (read_reg(0x82c) == 0) {
961			IVTV_ERR("Tried to open YUV output device but need to send data to mpeg decoder before it can be used\n");
962			/* return -ENODEV; */
963		}
964		ivtv_udma_alloc(itv);
965	}
966
967	/* Allocate memory */
968	item = kzalloc(sizeof(struct ivtv_open_id), GFP_KERNEL);
969	if (NULL == item) {
970		IVTV_DEBUG_WARN("nomem on v4l2 open\n");
971		return -ENOMEM;
972	}
973	v4l2_fh_init(&item->fh, s->vdev);
974	item->itv = itv;
975	item->type = s->type;
976
977	filp->private_data = &item->fh;
978	v4l2_fh_add(&item->fh);
979
980	if (item->type == IVTV_ENC_STREAM_TYPE_RAD &&
981			v4l2_fh_is_singular_file(filp)) {
982		if (!test_bit(IVTV_F_I_RADIO_USER, &itv->i_flags)) {
983			if (atomic_read(&itv->capturing) > 0) {
984				/* switching to radio while capture is
985				   in progress is not polite */
986				v4l2_fh_del(&item->fh);
987				v4l2_fh_exit(&item->fh);
988				kfree(item);
989				return -EBUSY;
990			}
991		}
992		/* Mark that the radio is being used. */
993		set_bit(IVTV_F_I_RADIO_USER, &itv->i_flags);
994		/* We have the radio */
995		ivtv_mute(itv);
996		/* Switch tuner to radio */
997		ivtv_call_all(itv, tuner, s_radio);
998		/* Select the correct audio input (i.e. radio tuner) */
999		ivtv_audio_set_io(itv);
1000		if (itv->hw_flags & IVTV_HW_SAA711X) {
1001			ivtv_call_hw(itv, IVTV_HW_SAA711X, video, s_crystal_freq,
1002				SAA7115_FREQ_32_11_MHZ, SAA7115_FREQ_FL_APLL);
1003		}
1004		/* Done! Unmute and continue. */
1005		ivtv_unmute(itv);
1006	}
1007
1008	/* YUV or MPG Decoding Mode? */
1009	if (s->type == IVTV_DEC_STREAM_TYPE_MPG) {
1010		clear_bit(IVTV_F_I_DEC_YUV, &itv->i_flags);
1011	} else if (s->type == IVTV_DEC_STREAM_TYPE_YUV) {
1012		set_bit(IVTV_F_I_DEC_YUV, &itv->i_flags);
1013		/* For yuv, we need to know the dma size before we start */
1014		itv->dma_data_req_size =
1015				1080 * ((itv->yuv_info.v4l2_src_h + 31) & ~31);
1016		itv->yuv_info.stream_size = 0;
1017	}
1018	return 0;
1019}
1020
1021void ivtv_mute(struct ivtv *itv)
1022{
1023	if (atomic_read(&itv->capturing))
1024		ivtv_vapi(itv, CX2341X_ENC_MUTE_AUDIO, 1, 1);
1025	IVTV_DEBUG_INFO("Mute\n");
1026}
1027
1028void ivtv_unmute(struct ivtv *itv)
1029{
1030	if (atomic_read(&itv->capturing)) {
1031		ivtv_msleep_timeout(100, 0);
1032		ivtv_vapi(itv, CX2341X_ENC_MISC, 1, 12);
1033		ivtv_vapi(itv, CX2341X_ENC_MUTE_AUDIO, 1, 0);
1034	}
1035	IVTV_DEBUG_INFO("Unmute\n");
1036}
1037